/*
    交换两个数的值
*/
#include <stdio.h>

int main(int argc, char const *argv[])
{
    int a = 11;
    int b = 66;

    printf("交换之前a = %d b = %d\n",a,b);

    a = a+b;
    b = a-b;
    a = a-b;
    printf("交换之后a = %d b = %d\n",a,b);

    return 0;
}